DE102006016938B3 - Hydraulic pulsation absorber for chassis/landing gear control systems has a casing with inlet and outlet points integrated in the base of the casing - Google Patents
Hydraulic pulsation absorber for chassis/landing gear control systems has a casing with inlet and outlet points integrated in the base of the casing Download PDFInfo
- Publication number
- DE102006016938B3 DE102006016938B3 DE200610016938 DE102006016938A DE102006016938B3 DE 102006016938 B3 DE102006016938 B3 DE 102006016938B3 DE 200610016938 DE200610016938 DE 200610016938 DE 102006016938 A DE102006016938 A DE 102006016938A DE 102006016938 B3 DE102006016938 B3 DE 102006016938B3
- Authority
- DE
- Germany
- Prior art keywords
- housing
- casing
- pulsation damper
- inlet
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/05—Buffers therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/021—Installations or systems with accumulators used for damping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/20—Accumulator cushioning means
- F15B2201/21—Accumulator cushioning means using springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/315—Accumulator separating means having flexible separating means
- F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/40—Constructional details of accumulators not otherwise provided for
- F15B2201/41—Liquid ports
- F15B2201/413—Liquid ports having multiple liquid ports
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Pipe Accessories (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen hydraulischen Pulsationsdämpfer und Verwendung eines hydraulischen Pulsationsdämpfers gemäß dem Oberbegriff des Anspruchs 1 und 5.The The present invention relates to a hydraulic pulsation damper and Use of a hydraulic pulsation damper according to the preamble of the claim 1 and 5.
Um einen erforderlichen Druck in Hydraulikkreisläufen bereitstellen zu können, werden Hydraulikpumpen eingesetzt. Diese erzeugen jedoch aufgrund von veränderlichen Betriebszuständen und/oder diskontinuierlichen Fördervorgängen Druck- und Volumenstrompulsationen, die sich über das Hydraulikmedium im Leitungssystem fortpflanzen. Derartige Druckpulsationen regen Komponenten des Hydrauliksystems, wie beispielsweise Leitungen, zu Schwingungen an, die wiederum einen Körperschall erzeugen, der zu einer unangenehmen Geräuschentwicklung führen kann. Um dem entgegenzuwirken wird versucht, die Körperschallausbreitung zu verhindern oder zumindest zu minimieren, indem bereits die Druckpulsationen so stark wie möglich gedämpft werden, so dass nach Möglichkeit weder Körper- noch Luftschall entsteht.Around to be able to provide a required pressure in hydraulic circuits Hydraulic pumps used. However, these generate due to variable Operating conditions and / or discontinuous conveying processes and volumetric flow pulsations that occur over the hydraulic medium in the Propagate pipeline system. Such pressure pulsations stimulate components the hydraulic system, such as lines, to vibrations which, in turn, produces a structure-borne noise generate, which can lead to an unpleasant noise. To counteract this, attempts are made to prevent structure-borne noise propagation or at least minimizing it, already by the pressure pulsations as strong as possible muted so, if possible neither body still airborne sound is created.
Aus
der
Aus
der
Weitere
Vorrichtungen zur Verringerung von Druckpulsationen sind beispielsweise
aus der
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen hydraulischen Pulsationsdämpfer der gattungsgemäßen Art eine verbesserte Ausführungsform und eine Verwendung anzugeben, welche sowohl niederfrequente als auch hochfrequente Schwingungen beziehungsweise Druckpulsationen besonders gut dämpft.The present invention employs dealing with the problem, for a hydraulic pulsation damper of the generic type an improved embodiment and to specify a use which is both low-frequency and also high-frequency vibrations or pressure pulsations dampens particularly well.
Dieses Problem wird erfindungsgemäß durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This Problem is inventively things the independent one claims solved. Advantageous embodiments are the subject of the dependent Claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, eine Innenmantelfläche des Gehäuses des gattungsgemäßen Pulsationsdämpfers mit einer flüssigkeitsdichten, elastischen Membran auszukleiden und zwischen dieser Membran und dem Gehäusemantel eine elastische Einlage anzuordnen, welche aufgrund ihrer elastischen Eigenschaft die Membran radial nach innen, das heißt vom Gehäusemantel weg, vorspannt. Die betriebsmitteldichte Membran hat dabei die Aufgabe, die elastische Einlage vor einem Kontakt mit der im Pulsationsdämpfer strömenden Flüssigkeit (Betriebsmittel) zu schützen und somit die Elastizität der Einlage langfristig zu gewährleisten. Der erfindungsgemäße hydraulische Pulsationsdämpfer wirkt dabei sowohl gegen niederfrequente als auch gegen hochfrequente Anteile der Druckpulsation, indem einerseits die elastische Einlage die niederfrequenten Anteile dämpft und andererseits die Querschnittssprünge im Bereich der Gehäuseböden zwischen Ablauf beziehungsweise Zulauf und Reflexionsraum zu Reflexionen und damit zu Interferenzen führen, was insbesondere die hochfrequenten Anteile dämpft. Der erfindungsgemäße Pulsationsdämpfer kennzeichnet sich somit durch eine breitbandige Dämpfung in einem großen Druckbereich aus.The The invention is based on the general idea, an inner circumferential surface of the Housing of the generic pulsation damper with a liquid-tight, lining elastic membrane and between this membrane and the housing jacket to arrange an elastic insert, which due to their elastic Property the membrane radially inward, that is from the housing shell away, pretentious. The agent-dense membrane has the task the elastic insert against contact with the liquid flowing in the pulsation damper (Resources) to protect and thus the elasticity to guarantee the deposit in the long term. The inventive hydraulic pulsation dampers acts both against low-frequency and high-frequency Shares of pressure pulsation, on the one hand, the elastic insert dampens the low-frequency components and on the other hand, the cross-sectional jumps in the region of the housing bottoms between Expiration or inflow and reflection space to reflections causing interference, which in particular dampens the high-frequency components. The pulsation damper according to the invention features thus characterized by a broadband attenuation in a large pressure range.
Gemäß einer vorteilhaften Ausführungsform der erfindungsgemäßen Lösung ist die Einlage federelastisch und/oder als Cellasto-Einlage ausgebildet. Eine federelastische Einlage dämpft aufgrund ihrer vorzugsweise progressiven Federkennlinie Schwingungen beziehungsweise Druckpulsationen in einem großen Druckbereich, was die Anwendung des erfindungsgemäßen Pulsationsdämpfers in einem großen Anwendungsgebiet erlaubt. Unter einer Cellasto-Einlage sind generell mikrozellige Polyurethan-Elastomere zu verstehen, welche aufgrund ihrer physikalischen Eigenschaften besonders für den Einsatz in dynamisch hoch belastbaren Systemen prädestiniert sind. Aufgrund der lediglich geringen Querdehnung auch bei größerer Stauchung können derartige mikrozellige Polyurethan-Elastomere besonders gut in kleinen Bauräumen angeordnet werden.According to one advantageous embodiment of the inventive solution the insert is elastic and / or designed as a Cellasto insert. A resilient insert dampens due to their preferably progressive spring characteristic oscillations or pressure pulsations in a large pressure range, which is the application of the Pulsation damper according to the invention in a big one Application area allowed. Under a Cellasto insert are general to understand microcellular polyurethane elastomers, due to their physical properties especially for use in dynamic highly resilient systems predestined are. Due to the only small transverse strain even with larger compression can Such microcellular polyurethane elastomers particularly good in small installation spaces to be ordered.
Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung weist die Einlage zumindest zwei koaxiale Lagen mit unterschiedlicher Steifigkeit auf. Durch eine derartige Lagenanordnung mit unterschiedlicher Steifigkeit der einzelnen Lagen kann eine besonders gute Anpassung an einen Betriebsbereich des Pulsationsdämpfers erfolgen, in welchem dann die elastischen Eigenschaften der verwendeten Einlage eine besonders hohe Dämpfung von Druckpulsationen erlauben.at a further advantageous embodiment of the inventive solution the insert at least two coaxial layers with different Stiffness up. By such a layer arrangement with different Stiffness of the individual layers can be a particularly good match to an operating range of the pulsation damper, in which then the elastic properties of the insert used particularly high damping allow for pressure pulsations.
Zweckmäßig ist der Ablauf in den Reflexionsraum hinein verlängert, wodurch eine Art Pfeife entsteht. Eine derartige Verlängerung beziehungsweise Pfeife bietet dabei den Vorteil, Dämpfungseinbrüche zu vermeiden oder zumindest zu minimieren, wodurch eine Pulsationsdämpfung noch effektiver gestaltet werden kann.The process is expedient in the reflection extended into space, creating a kind of pipe. Such an extension or whistle offers the advantage of avoiding or at least minimizing attenuation dips, whereby a pulsation damping can be made even more effective.
Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung ist die Membran entlang einer Berührungskante beziehungsweise entlang einer Berührungsfläche zwischen dem jeweiligen Gehäuseboden und dem Gehäusemantel eingespannt. Dabei kann der Gehäusemantel gehäusebodenseitig eine konische Anlagefläche aufweisen, welche komplementär zu konischen Anlageflächen des jeweiligen Gehäusemantels ausgebildet ist und eine dichte Verbindung zwischen Gehäuseboden und Gehäusemantel erlaubt. Die konische Ausbildung der Anlageflächen bewirkt darüber hinaus, dass bei einer Verspannung der beiden Gehäuseböden aufeinanderzu eine Zentrierung derselben bezüglich des Gehäusemantels erreicht werden kann.at a further advantageous embodiment of the solution according to the invention the membrane along a contact edge or along a contact surface between the respective caseback and the housing shell clamped. In this case, the housing shell housing bottom side a conical contact surface which are complementary to conical contact surfaces of the respective housing jacket is formed and a tight connection between the housing bottom and housing jacket allowed. The conical design of the contact surfaces also causes that at a tension of the two housing bases to each other centering the same with respect to of the housing jacket can be achieved.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the invention will become apparent from the Dependent claims, from the drawings and from the associated description of the figures the drawings.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It it is understood that the above and the following yet to be explained features not only in the specified combination, but also in other combinations or alone, without to leave the scope of the present invention.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.preferred embodiments The invention are illustrated in the drawings and in the following description explains where like reference numerals refer to the same or similar or functionally identical components relate.
Dabei zeigen, jeweils schematisch,there show, in each case schematically,
Entsprechend
Eine
Innenmantelfläche
des Gehäusemantels
Dabei
ist die Einlage
Dabei
kann die Einlage
Bei
den gemäß den
Um
Dämpfungseinbrüche wirkungsvoll
vermeiden beziehungsweise zumindest reduzieren zu können, kann
der Ablauf
Gemäß den
In
Generell
kann der erfindungsgemäße Pulsationsdämpfer
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610016938 DE102006016938B3 (en) | 2006-04-11 | 2006-04-11 | Hydraulic pulsation absorber for chassis/landing gear control systems has a casing with inlet and outlet points integrated in the base of the casing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610016938 DE102006016938B3 (en) | 2006-04-11 | 2006-04-11 | Hydraulic pulsation absorber for chassis/landing gear control systems has a casing with inlet and outlet points integrated in the base of the casing |
Publications (1)
Publication Number | Publication Date |
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DE102006016938B3 true DE102006016938B3 (en) | 2007-12-06 |
Family
ID=38650782
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DE200610016938 Expired - Fee Related DE102006016938B3 (en) | 2006-04-11 | 2006-04-11 | Hydraulic pulsation absorber for chassis/landing gear control systems has a casing with inlet and outlet points integrated in the base of the casing |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007045266A1 (en) * | 2007-09-21 | 2009-04-02 | Hydac Technology Gmbh | Damping device, in particular pulsation damper |
EP2107287A2 (en) * | 2008-04-04 | 2009-10-07 | SOPLASNOR - Sociedade de Plasticos do Norte, S.A. | Silencer for a water dispensing device, in particular for a flush tank fill valve or a similar device |
DE102008043655A1 (en) * | 2008-11-12 | 2010-05-20 | Robert Bosch Gmbh | Hydraulic system has working device, drive device connected with working device by hydraulic line and pressure balancing device assigned to hydraulic line |
DE102010027773A1 (en) * | 2010-04-15 | 2011-10-20 | Continental Teves Ag & Co. Ohg | Pulsation damping capsule, particularly for use in connection to pressure side of piston pump, has durable metal casing which is enclosed by liquid impermeable mass, where mass is manufactured by using elastic paint |
CN102434753A (en) * | 2011-10-22 | 2012-05-02 | 成都市翻鑫家科技有限公司 | Bidirectional oil pressure buffer |
US8636128B2 (en) | 2009-01-22 | 2014-01-28 | Fte Automotive Gmbh | Slave cylinder for a vibration-damped hydraulic force transmission system, particularly a hydraulic clutch actuating system for motor vehicles |
CN105782632A (en) * | 2016-04-22 | 2016-07-20 | 华北水利水电大学 | Composite pressure pipeline capable of weakening water attacks and manufacturing method thereof |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7236392U (en) * | 1974-03-21 | Bosch R Gmbh | Pulsation damper | |
DE3301332A1 (en) * | 1983-01-17 | 1984-07-19 | Industrielle Planungs- und Marketing-Anstalt, Vaduz | Device for protection of liquid lines against detonations |
DE3333597A1 (en) * | 1983-09-16 | 1985-04-18 | Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder | Accumulator |
DE3544368A1 (en) * | 1985-12-14 | 1987-06-19 | Korthaus Ernst | Pressure damper |
DE4131501A1 (en) * | 1991-09-21 | 1993-03-25 | Bosch Gmbh Robert | Damper for pressure waves in IC- engine fuel feed pipe - reduces tension in fluid in fluid chamber fluid-tightly sepd. from damper chamber by membrane |
DE19516358C1 (en) * | 1995-05-04 | 1996-08-22 | Daimler Benz Ag | Fuel pulsation damper in fuel supply system of IC engine |
US6029708A (en) * | 1998-03-11 | 2000-02-29 | Inventio Ag | Pulsation damper for a hydraulic elevator |
EP1002984A2 (en) * | 1998-11-21 | 2000-05-24 | Frey, Conrad | Water hammer and noise attenuator for water pipes and taps |
-
2006
- 2006-04-11 DE DE200610016938 patent/DE102006016938B3/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7236392U (en) * | 1974-03-21 | Bosch R Gmbh | Pulsation damper | |
DE3301332A1 (en) * | 1983-01-17 | 1984-07-19 | Industrielle Planungs- und Marketing-Anstalt, Vaduz | Device for protection of liquid lines against detonations |
DE3333597A1 (en) * | 1983-09-16 | 1985-04-18 | Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder | Accumulator |
DE3544368A1 (en) * | 1985-12-14 | 1987-06-19 | Korthaus Ernst | Pressure damper |
DE4131501A1 (en) * | 1991-09-21 | 1993-03-25 | Bosch Gmbh Robert | Damper for pressure waves in IC- engine fuel feed pipe - reduces tension in fluid in fluid chamber fluid-tightly sepd. from damper chamber by membrane |
DE19516358C1 (en) * | 1995-05-04 | 1996-08-22 | Daimler Benz Ag | Fuel pulsation damper in fuel supply system of IC engine |
US6029708A (en) * | 1998-03-11 | 2000-02-29 | Inventio Ag | Pulsation damper for a hydraulic elevator |
EP1002984A2 (en) * | 1998-11-21 | 2000-05-24 | Frey, Conrad | Water hammer and noise attenuator for water pipes and taps |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007045266A1 (en) * | 2007-09-21 | 2009-04-02 | Hydac Technology Gmbh | Damping device, in particular pulsation damper |
US8132645B2 (en) | 2007-09-21 | 2012-03-13 | Hydac Technology Gmbh | Attenuation device particularly pulsation attenuator |
EP2107287A2 (en) * | 2008-04-04 | 2009-10-07 | SOPLASNOR - Sociedade de Plasticos do Norte, S.A. | Silencer for a water dispensing device, in particular for a flush tank fill valve or a similar device |
DE102008043655A1 (en) * | 2008-11-12 | 2010-05-20 | Robert Bosch Gmbh | Hydraulic system has working device, drive device connected with working device by hydraulic line and pressure balancing device assigned to hydraulic line |
US8636128B2 (en) | 2009-01-22 | 2014-01-28 | Fte Automotive Gmbh | Slave cylinder for a vibration-damped hydraulic force transmission system, particularly a hydraulic clutch actuating system for motor vehicles |
US9404544B2 (en) | 2009-01-22 | 2016-08-02 | Fte Automotive Gmbh | Slave cylinder for a vibration-damped hydraulic force transmission system, particularly a hydraulic clutch actuating system for motor vehicles |
DE102010027773A1 (en) * | 2010-04-15 | 2011-10-20 | Continental Teves Ag & Co. Ohg | Pulsation damping capsule, particularly for use in connection to pressure side of piston pump, has durable metal casing which is enclosed by liquid impermeable mass, where mass is manufactured by using elastic paint |
CN102434753A (en) * | 2011-10-22 | 2012-05-02 | 成都市翻鑫家科技有限公司 | Bidirectional oil pressure buffer |
CN105782632A (en) * | 2016-04-22 | 2016-07-20 | 华北水利水电大学 | Composite pressure pipeline capable of weakening water attacks and manufacturing method thereof |
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8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT, 7, DE |
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8327 | Change in the person/name/address of the patent owner |
Owner name: DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT, 7, DE |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |